Puntuado con 1 de 5 estrellas

I couldn't install this

what browser version are you using? after you install it, click on the drop down on the google search box at the upper right corner of your browser, you should see a whois logo, choose that.

Puntuado con 1 de 5 estrellas

Just shows you a report you need to pay money for.

Puntuado con 5 de 5 estrellas

Excellent addon, I was able to find the domains I was looking for in my hunt for typosquaters

Puntuado con 1 de 5 estrellas

Leads to a commercial service (aka stealth advertisement).